What’s the big deal about mocking someone’s accent?

As a society, we’re getting better at not being dicks to each other. It’s a slow progression, but some hurdles have been royally leapt: women can vote, homosexual couples can adopt, and ethnic minorities legally have access to the same goods and services as everybody else. Of course, we still deal with individual douche-canoes mouthing off at people because of their sexuality, gender identity, race, ability, age, body shape or a million other things; institutionalised prejudice hasn’t been eradicated; and prejudice is still enacted on a micro-level, often not from a malicious footing, but as the product of a society still breaking free of intolerant belief systems (that blasted patriarchy!). I’ve painted a cheery picture there, haven’t I? … but in general, while things are by no stretch of the imagination fixed, in most ways they’re getting better, and we’re a lot sounder to each other than we used to…